Question
GeneralGeneralGeneral

What is the atomic mass of Br?

Verified Answer

The atomic mass of bromine (Br) is approximately:

79.9 u (atomic mass units)

Why is it not a whole number?

Bromine exists naturally as a mixture of two isotopes:

  • Br-79
  • Br-81

The atomic mass (79.9 u) is a weighted average of these isotopes based on their natural abundance.

Key Takeaway:

The atomic mass of bromine is 79.9 u, representing the average mass of its naturally occurring isotopes.